Knob mounting structure for a thermal magnetic trip system

Abstract

The application discloses a knob mounting structure of a thermal magnetic tripping system, which comprises a knob rotatably arranged between a middle cover and an upper cover, the middle cover comprises an adjusting hole and an entering port which are connected, an eccentric rod of the knob is slid into the adjusting hole from the entering port, a limiting structure is arranged on the eccentric rod and used for limiting the eccentric rod from falling out of the adjusting hole, and a preventing structure is arranged between the knob and the upper cover and used for preventing the eccentric rod from sliding back to the entering port.

Description

Technical Field

[0001] This invention relates to the technical field of low-voltage electrical appliances, and more specifically to a knob mounting structure for a thermomagnetic tripping system. Background Technology

[0002] The thermal-magnetic trip unit is connected to the mechanism of a molded case circuit breaker. Its function is to cut off the power supply when an abnormality occurs in the circuit, thereby providing short-circuit and overload protection. Existing thermal-magnetic trip units consist of two parts: a thermal trip mechanism and an electromagnetic trip mechanism. The thermal trip mechanism uses the thermal effect of current to deform the bimetallic strip, directly driving the mechanism to trip. The electromagnetic trip mechanism uses the short-circuit current of the electromagnetic coil to instantaneously push the armature, thereby driving the mechanism to trip.

[0003] Existing thermomagnetic trip units are divided into fixed and adjustable types. The adjustable thermomagnetic trip unit achieves overcurrent and overload protection by adjusting the distance between the thermo-bimetallic element and the traction rod, thereby allowing for adjustable overload protection operating current. For example, Chinese patent document CN210778460U discloses a structural improvement of a thermomagnetic adjustable trip unit for molded case circuit breakers, including a middle cover, a base, and a thermal trip unit disposed in the base. The thermal trip unit includes a traction rod, a bimetallic strip, an adjustment knob, and a thermal adjustment rod. The thermal adjustment rod has an adjustment groove, and the adjustment knob has an eccentric rod passing through the adjustment groove. The middle cover has a mounting groove corresponding to the position of the adjustment groove, which is adapted to the rotation of the adjustment knob. The adjustment knob is embedded in the mounting groove for rotational cooperation. An eccentric through groove is provided in the mounting groove corresponding to the stroke path of the eccentric rod, and the eccentric rod extends through the eccentric through groove into the adjustment groove of the thermal adjustment rod.

[0004] As can be seen from the structure of the thermomagnetic adjustable trip unit, the following problems still exist in actual use: During product assembly, the adjustment knob is easy to fall directly out of the mounting groove of the middle cover, which is not conducive to the installation and use of the adjustment knob and the thermal adjustment rod. This will slow down the assembly rhythm, reduce assembly efficiency, and affect the product assembly quality. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problem that the adjustment knob in the prior art is easy to fall off the middle cover during the assembly process, which slows down the assembly rhythm, reduces assembly efficiency, and affects the product assembly quality.

[0006] To solve the above-mentioned technical problems, the present invention provides a knob mounting structure for a thermomagnetic tripping system, including a knob rotatably mounted on a middle cover and an upper cover. The knob includes an eccentric rod offset from its rotation center. The middle cover includes an adjustment hole extending along the movement trajectory of the eccentric rod and an inlet connected to one end of the adjustment hole for the eccentric rod to pass through. The eccentric rod slides from the inlet into the adjustment hole. The eccentric rod is provided with a limiting structure that forms a limiting engagement with the middle cover and is used to restrict the eccentric rod from disengaging from above the adjustment hole. When the limiting structure slides back to the inlet with the eccentric rod, it releases the limiting engagement with the middle cover and can exit from the inlet under the action of the eccentric rod. An anti-retraction structure is provided between the knob and the upper cover to prevent the eccentric rod from sliding back to the inlet.

[0007] As a preferred embodiment, the limiting structure is a limiting protrusion formed on the side wall of the eccentric rod. After the eccentric rod drives the limiting protrusion through the inlet, it rotates to the lower part of the adjustment hole. The limiting protrusion is slidably connected to the lower end of the adjustment hole by the restriction of the middle cover.

[0008] As a preferred embodiment, the middle cover includes a limiting groove extending along the movement trajectory of the eccentric rod and disposed below the adjustment hole. The limiting protrusion is slidably accommodated in the limiting groove. A limiting stop is provided between the limiting groove and the adjustment hole to prevent the limiting protrusion from dislodging from the adjustment hole. One end of the limiting groove extends and connects to the inlet.

[0009] As a preferred embodiment, the middle cover is provided with a mounting groove for rotating the knob, the adjustment hole is arranged in the mounting groove in an arc shape, the eccentric rod moves along the adjustment hole in an arc trajectory under the drive of the knob, and the diameter of the inlet is larger than the diameter of the adjustment hole.

[0010] As a preferred embodiment, the knob includes a knob disc that is rotatably accommodated in the mounting groove, and an operating lever that is vertically disposed on the upper side of the knob disc. The operating lever is rotatably disposed coaxially with the knob disc. An eccentric rod is vertically disposed on the lower side of the knob disc and is not coaxially disposed with the operating lever. The operating lever has a drive groove protruding from the top of the upper cover.

[0011] As a preferred embodiment, the top cover includes an operating hole for exposing the operating lever, and a receiving groove disposed below the operating hole and connected to the mounting groove. The anti-retraction structure includes a backstop rod disposed on the upper side of the knob disc, and an anti-retraction boss disposed in the receiving groove and located on the movement path of the backstop rod. The anti-retraction boss is arc-shaped and located above the inlet. When the backstop rod abuts against one end of the anti-retraction boss as the knob rotates, it prevents the eccentric rod from sliding back from the adjustment hole into the inlet.

[0012] As a preferred embodiment, the anti-reverse rod and the eccentric rod are coaxially arranged on the knob disk, and the eccentric rod is integrally formed or fixedly installed on the knob disk.

[0013] As a preferred embodiment, the mounting groove is circular, and a gearing structure is provided between the knob and the mounting groove. The gearing structure includes an elastic lever disposed on the outer periphery of the knob disc and a plurality of gearing slots correspondingly disposed on the side wall of the mounting groove. A buffer groove is provided between the elastic lever and the knob disc. During the rotation of the knob, the elastic lever is driven to engage with one of the gearing slots.

[0014] As a preferred embodiment, the multiple gear slots are respectively an initial position slot, a first gear slot, a second gear slot, and a third gear slot disposed on the side wall of the mounting slot. The first gear slot, the second gear slot, and the third gear slot are arranged at equal intervals. The elastic lever is connected to the initial position slot when the eccentric rod is located at the inlet. The line connecting the elastic lever and the indicator rod passes through the axis of the operating rod.

[0015] As a preferred embodiment, an indicator structure for indicating the rotational position of the eccentric rod is provided between the operating lever and the upper cover. The indicator structure includes an arrow groove provided at the top of the operating lever and multiple indicator marks provided around the operating lever on the upper cover and corresponding to multiple gear slots. The arrow groove is connected to one end of the drive slot, and the anti-reverse rod is located at the end of the arrow groove.

[0016] The technical solution of this invention has the following advantages compared with the prior art:

[0017] 1. In the knob mounting structure provided by this invention, a limiting structure that allows free passage through the inlet is provided on the eccentric rod. During installation, the knob is first installed on the middle cover. After the eccentric rod drives the limiting structure through the inlet, it slides into the adjustment hole. The eccentric rod in the adjustment hole forms a limiting fit with the middle cover through the limiting structure, thus preventing the eccentric rod from coming out of the adjustment hole. This provides a limiting installation function for the knob and the middle cover. Then, the upper cover is installed on the middle cover. An anti-retraction structure set between the knob and the upper cover can prevent the eccentric rod from sliding back to the inlet, preventing the eccentric rod from driving the limiting structure out of the inlet and separating from the middle cover. This ensures that the eccentric rod only slides back and forth in the adjustment hole to achieve the gear adjustment function. This structural design can prevent the knob from falling out of the middle cover during assembly, achieving quick assembly and limiting anti-retraction functions between the knob and the middle cover. The structure is more compact, installation and disassembly are more convenient, installation stability is good, which helps to speed up the assembly rhythm, improve assembly efficiency, and ensure product assembly quality.

[0018] 2. In the knob mounting structure provided by the present invention, the limiting structure is a limiting protrusion formed on the side wall of the eccentric rod. By providing a limiting groove connected to the lower part of the adjustment hole on the middle cover, and setting a limiting stop between the limiting groove and the adjustment hole, when the eccentric rod slides from the inlet to the adjustment hole, it will correspondingly drive the limiting protrusion to slide into the limiting groove, so that the limiting protrusion and the limiting stop form a limiting fit with sliding contact. Because the limiting protrusion is blocked by the limiting stop, the eccentric rod cannot be directly disengaged from the top of the adjustment hole along its axial direction. This achieves the limiting installation between the eccentric rod and the adjustment hole, thereby avoiding the accident of the knob falling off when it is installed on the middle cover.

[0019] 3. In the knob installation structure provided by the present invention, after the top cover is installed, when the knob drives the eccentric rod to slide to the end connected to the adjustment hole and the inlet, the anti-reverse rod will be blocked by the anti-reverse boss to prevent the eccentric rod from retracting from the adjustment hole to the inlet, thereby limiting the adjustment rod to reciprocate in the adjustment hole for gear adjustment. This knob and top cover achieve anti-disengagement and anti-misalignment functions through the cooperation of the anti-reverse boss and the anti-reverse rod, and the installation and cooperation are stable and reliable.

[0020] 4. In the knob mounting structure provided by this invention, the anti-reverse rod and the eccentric rod are coaxially arranged on the knob disc. As long as the eccentric rod is still inserted in the inlet position, the anti-reverse rod will be positioned in the installation position of the anti-reverse boss to restrict the assembly of the top cover. The anti-foolproof design of the anti-reverse rod and the anti-reverse boss plays a corrective and constraining role in the correct installation of the top cover. Therefore, the top cover can only be correctly assembled onto the middle cover after the eccentric rod slides from the inlet to the adjustment hole.

[0021] 5. In the knob installation structure provided by the present invention, the knob drives the elastic lever to move back and forth between multiple gear slots during rotation, and the gear shift can be clearly sensed, which can meet the user's needs for multi-gear adjustment. When the elastic lever is squeezed into the corresponding gear slot by its own elastic deformation force, the elastic lever and the gear slot maintain close contact to prevent the knob from rotating arbitrarily. This design makes gear adjustment by rotating the knob more accurate and comfortable, and improves the performance of the product.

[0022] 6. In the knob installation structure provided by the present invention, the top of the operating lever is provided with an arrow groove connected to one end of the drive groove, and the upper cover is provided with multiple indicator marks corresponding to multiple gear slots. With this structure, when the knob is rotated to adjust the gear, the adjustment gear of the knob can be clearly known by observing the arrow groove pointing to a certain indicator mark. The observation is clear and concise, which plays a reminder and indication role. It can promptly provide feedback on the gear adjustment information of the thermomagnetic tripping system, ensuring the safe and reliable use of the product. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 A top view of the knob mounting structure provided by the present invention;

[0025] Figure 2 for Figure 1 The diagram shows the split structure of the middle cover and the top cover, with the knob specifically shown;

[0026] Figure 3 for Figure 1 A schematic diagram of the cross-sectional structure along line AA is shown.

[0027] Figure 4 This is a partially enlarged schematic diagram of the knob mounting structure of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of the knob of the present invention installed in the bottom view of the middle cover;

[0029] Figure 6 This is a top view of the structure of the knob of the present invention installed on the middle cover;

[0030] Figure 7 This is a schematic diagram of the separate structure of the knob and the middle cover of the present invention;

[0031] Figure 8 This is a schematic diagram of the knob of the present invention in its initial position;

[0032] Figure 9 This is a schematic diagram of the structure of the knob of the present invention when it is adjusted to the first position;

[0033] Figure 10 This is a schematic diagram of the knob adjustment to the second position according to the present invention;

[0034] Figure 11 This is a schematic diagram of the knob adjustment to the third position according to the present invention;

[0035] Explanation of reference numerals in the attached drawings: 1. Middle cover; 11. Limiting slide groove; 12. Limiting stop; 2. Top cover; 21. Receiving groove; 22. Operating hole; 23. Mounting groove; 3. Knob; 31. Eccentric rod; 32. Knob disc; 33. Operating lever; 34. Elastic lever; 35. Drive groove; 36. Arrow groove; 37. Buffer groove; 4. Limiting structure; 5. Adjustment hole; 6. Inlet; 7. Anti-reverse rod; 8. Anti-reverse boss; 90. Initial position groove; 91. First gear groove; 92. Second gear groove; 93. Third gear groove. Detailed Implementation

[0036] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0040] Example 1

[0041] This invention provides, for example Figure 1-11The rotary mounting structure of a thermomagnetic tripping system shown includes a knob 3 rotatably mounted on a middle cover 1 and an upper cover 2. The knob 3 includes an eccentric rod 31 offset from its rotation center. The middle cover 1 includes an adjustment hole 5 extending along the movement trajectory of the eccentric rod 31 and an inlet 6 connected to one end of the adjustment hole 5, through which the eccentric rod 31 can pass. The eccentric rod 31 slides from the inlet 6 into the adjustment hole 5. The eccentric rod 31 is provided with a limiting structure 4 that forms a limiting fit with the middle cover 1 and is used to limit the eccentric rod 31 from disengaging from above the adjustment hole 5. When the limiting structure 4 slides back to the inlet 6 with the eccentric rod 31, it releases the limiting fit with the middle cover 1 and can exit from the inlet 6 under the action of the eccentric rod 31. An anti-retraction structure is provided between the knob 3 and the upper cover 2 to prevent the eccentric rod 31 from sliding back to the inlet 6.

[0042] The above-described implementation method is the core technical solution of this embodiment. During installation, the knob 3 is first installed on the middle cover 1. The eccentric rod 31 drives the limiting structure 4 through the inlet and then slides into the adjustment hole 5. The eccentric rod 31 in the adjustment hole forms a limiting fit with the middle cover 1 through the limiting structure 4, thereby preventing the eccentric rod 31 from coming out of the adjustment hole 5, thus limiting the installation of the knob 3 and the middle cover 1. Then, when the upper cover is installed on the middle cover, the anti-retraction structure set between the knob 3 and the upper cover 2 can prevent the eccentric rod 3 from coming out of the adjustment hole 5. The eccentric rod 31 then slides back to the inlet 6, preventing the eccentric rod 31 from pulling the limiting structure 4 out of the inlet 6 and separating it from the middle cover 1. This ensures that the eccentric rod 31 only slides back and forth in the adjusting hole 5 to achieve the gear adjustment function. This structural design can prevent the knob from falling out of the middle cover during assembly, realize the quick assembly and limiting anti-detachment function between the knob and the middle cover, make the structure more compact, make installation and disassembly more convenient, have good installation stability, help speed up the assembly rhythm, improve assembly efficiency, and ensure product assembly quality.

[0043] The following is combined Figure 3-7 The specific arrangement of the knob and the middle cover is described in detail below:

[0044] The limiting structure 4 is a limiting protrusion formed on the side wall of the eccentric rod 31. After the eccentric rod 31 drives the limiting protrusion through the inlet 6, it rotates to the lower part of the adjustment hole 5. The limiting protrusion is slidably connected to the lower end of the adjustment hole 5 by the restriction of the middle cover 1. More specifically, the middle cover 1 includes a limiting groove 11 extending along the movement trajectory of the eccentric rod 31 and disposed below the adjustment hole 5. The limiting protrusion is slidably accommodated in the limiting groove 11. A limiting stop 12 is provided between the limiting groove 11 and the adjustment hole 5 to prevent the limiting protrusion from falling out of the adjustment hole 5. One end of the limiting groove 11 extends and connects to the inlet 6. With this structural design, when the eccentric rod 31 slides from the inlet 6 to the adjustment hole 5, it will correspondingly drive the limiting protrusion to slide into the limiting groove 11, so that the limiting protrusion and the limiting stop 12 form a limiting fit with sliding contact. Because the limiting protrusion is blocked by the limiting stop 12, the eccentric rod 31 cannot be directly disengaged from above the adjustment hole 5 along its axial direction. This achieves the limiting installation between the eccentric rod and the adjustment hole, thereby avoiding the accident of the knob falling off when it is installed on the middle cover.

[0045] In a preferred embodiment, the middle cover 1 is provided with a mounting groove 23 for rotatably connecting the knob 3. The mounting groove 23 is circular, and the adjustment hole 5 is arc-shaped and disposed in the mounting groove 23. The eccentric rod 31 moves along the adjustment hole 5 in an arc trajectory under the drive of the knob 3. Correspondingly, the limiting slide groove 11 is an arc slide groove structure. The diameter of the inlet 6 is larger than the diameter of the adjustment hole 5, and the width of the limiting protrusion is larger than the diameter of the adjustment hole 5. This design allows the limiting protrusion to freely enter and exit the position of the inlet 6 following the eccentric rod 31, but it cannot be pulled out from the position of the adjustment hole 5. Therefore, an anti-retraction structure is designed to restrict the eccentric rod 31 from driving the limiting protrusion back to the inlet position.

[0046] The following is combined Figure 1-4 The specific arrangement of the knob and the top cover is described in detail below:

[0047] The knob 3 includes a knob disc 32 rotatably accommodated in the mounting groove 23, and an operating rod 33 vertically disposed on the upper side of the knob disc 3. The operating rod 33 is rotatably disposed coaxially with the knob disc 32. An eccentric rod 31 is vertically disposed on the lower side of the knob disc 32 and is not coaxially disposed with the operating rod 33, that is, the eccentric rod 31 is offset from the axis of the operating rod 33. The operating rod 33 is provided with a drive groove 35 protruding from the top of the upper cover 2. The operating rod 33 is turned in the drive groove 35 by using a screwdriver or other tools, thereby realizing the rotation adjustment operation of the knob 3.

[0048] like Figure 2 As shown, the upper cover 2 includes an operation hole 22 through which the operation lever 33 can be exposed, and a receiving groove 21 disposed below the operation hole 22 and connected to the mounting groove 23. The anti-reverse structure includes a backstop rod 7 disposed on the upper side of the knob disc 32, and an anti-reverse boss 8 disposed in the receiving groove 21 and located on the movement path of the backstop rod. The anti-reverse boss 8 is arc-shaped and located above the inlet 6. (Referring to...) Figure 3-4 The anti-reverse rod 7 and the eccentric rod 31 are coaxially mounted on the knob disc 32. As long as the eccentric rod 31 is inserted into the inlet 6, it will cause the anti-reverse rod to be positioned on the anti-reverse protrusion 8 to restrict the assembly of the upper cover 2. The anti-foolproof design of the anti-reverse rod 7 and the anti-reverse protrusion 8 provides corrective constraint for the correct installation of the upper cover 2. Therefore, the upper cover 2 can only be correctly assembled onto the middle cover 1 after the eccentric rod 31 slides from the inlet 6 to the adjustment hole 5. This eccentric rod 31 can be integrally formed on the knob disc 32, or it can be fixed to the knob disc 32 by snap-fit ​​or screw connection. With this structural design, after the top cover 2 is installed, when the knob 3 drives the eccentric rod 31 to slide to the end where the adjustment hole 5 is connected to the inlet 6, the anti-reverse rod rotates under the action of the knob 3 and abuts against one end of the anti-reverse protrusion 8. At this time, the anti-reverse rod is blocked by the anti-reverse protrusion 8, preventing the eccentric rod 31 from retracting from the adjustment hole 5 into the inlet 6. This limits the adjustment rod to reciprocating movement within the adjustment hole 5. This knob 3 and top cover 2 achieve anti-detachment and anti-misalignment functions through the cooperation of the anti-reverse protrusion 8 and the anti-reverse rod, ensuring stable and reliable installation and connection.

[0049] In this embodiment, a stop structure is provided between the knob 3 and the mounting groove 23, for reference. Figure 6-7 The gear shifting structure includes an elastic lever 34 disposed on the outer periphery of the rotary disc 32 and multiple gear shift slots correspondingly disposed on the side wall of the mounting groove 23. A buffer groove 37 is provided between the elastic lever 34 and the rotary disc 32. During the rotation of the knob 3, the elastic lever 34 is driven to engage with one of the gear shift slots. The advantage of this design is that during the rotation of the knob 3, the elastic lever 34 moves back and forth between multiple gear shift slots, and the gear shifting can be clearly felt, which can meet the user's needs for multi-gear adjustment. When the elastic lever 34 is squeezed into the corresponding gear shift slot by its own elastic deformation force, the elastic lever 34 and the gear shift slot maintain close contact to prevent the knob 3 from rotating arbitrarily. This design makes gear adjustment by rotating the knob 3 more accurate and comfortable, making gear switching more accurate and obvious, and improving the performance of the product.

[0050] As a specific structural arrangement, the multiple gear slots are respectively an initial position slot 90, a first gear slot 91, a second gear slot 92, and a third gear slot 93 disposed on the side wall of the mounting slot 23. The first gear slot 91, the second gear slot 92, and the third gear slot 93 are arranged at equal intervals. The line connecting the elastic lever 34 and the indicator rod passes through the axis of the operating lever 33. (Reference) Figure 8 When knob 3 is first assembled onto the middle cover 1, the eccentric rod 31 and the limiting protrusion correspondingly insert into the inlet 6, and drive the elastic lever 34 to connect precisely in the initial position slot 90. At this time, knob 3 is in the initial installation position; Reference Figure 9-11 When the knob 3 is rotated for gear adjustment, when the elastic lever 34 switches sequentially from the initial position slot 90 to the first gear slot 91, the corresponding eccentric rod 31 slides from the inlet 6 to one end of the adjustment hole 5 to achieve the first gear adjustment of the knob; when the elastic lever 34 continues to switch to the second gear slot 92, the corresponding eccentric rod 31 slides to the middle of the adjustment hole 5 to achieve the second gear adjustment of the knob; when the elastic lever 34 continues to switch to the third gear slot 93, the corresponding eccentric rod 31 slides to the other end of the adjustment hole 5 to achieve the third gear adjustment of the knob. In this embodiment, the knob can achieve three-gear adjustment function through the sliding cooperation between the eccentric rod 31 and the adjustment hole 5.

[0051] To ensure users can clearly observe the gear adjustment position of knob 3 from the outside, combined with Figure 1 and 6 As shown, an indicator structure for indicating the rotational position of the eccentric rod 31 is provided between the operating lever 33 and the upper cover 2. The indicator structure includes an arrow groove 36 at the top of the operating lever 33 and multiple indicator marks surrounding the operating lever 33 on the upper cover 2 and corresponding to multiple gear slots. The arrow groove 36 is connected to one end of the drive slot 35, and the anti-reverse rod is located at the end of the arrow groove 36. The multiple indicator marks can be selected as corresponding digital gear marks. With this structure, when the knob 3 is rotated to adjust the gear, the adjustment gear can be clearly known by observing that the arrow groove 36 points to a certain indicator mark. The observation is clear and concise, which serves as a reminder and indication effect. It can promptly provide feedback on the gear adjustment information of the thermomagnetic tripping system, ensuring the safe and reliable use of the product.

[0052] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A knob mounting structure for a thermomagnetic tripping system, comprising a knob (3) rotatably disposed on a middle cover (1) and an upper cover (2), wherein the knob (3) includes an eccentric rod (31) offset from its rotation center, characterized in that: The middle cover (1) includes an adjustment hole (5) extending along the movement trajectory of the eccentric rod, and an inlet (6) connected to one end of the adjustment hole (5) for the eccentric rod to pass through. The eccentric rod (31) slides into the adjustment hole (5) through the inlet (6). The eccentric rod (31) is provided with a limiting structure (4) that forms a limiting fit with the middle cover (1) and is used to limit the eccentric rod (31) from coming out of the adjustment hole. When the limiting structure (4) slides back to the inlet (6) with the eccentric rod (31), it releases the limiting fit with the middle cover (1) and can exit from the inlet (6) under the drive of the eccentric rod (31). An anti-retraction structure is provided between the knob (3) and the upper cover (2) to prevent the eccentric rod (31) from sliding back to the inlet (6). The middle cover (1) is provided with a mounting groove (23) for rotating connection of the knob (3). The knob (3) includes a knob disc (32) rotatably accommodated in the mounting groove (23) and an operating rod (33) vertically disposed on the upper side of the knob disc (32). The upper cover (2) includes an operation hole (22) through which the operation lever (33) is exposed, and a receiving groove (21) located below the operation hole (22) and connected to the mounting groove (23). The anti-retraction structure includes a backstop rod (7) located on the upper side of the knob disc (32), and an anti-retraction boss (8) located in the receiving groove (21) and on the movement path of the backstop rod. The anti-retraction boss (8) is arc-shaped and located above the inlet (6). When the backstop rod (7) rotates with the knob (3) and abuts against one end of the anti-retraction boss (8), it restricts the eccentric rod (31) from sliding back from the adjustment hole (5) into the inlet (6).

2. The knob mounting structure of the thermomagnetic tripping system according to claim 1, characterized in that: The limiting structure (4) is a limiting protrusion formed on the side wall of the eccentric rod (31). After the eccentric rod (31) drives the limiting protrusion through the inlet (6) and rotates to the lower part of the adjustment hole (5), the limiting protrusion is slidably connected to the lower end of the adjustment hole (5) by the restriction of the middle cover (1).

3. The knob mounting structure of the thermomagnetic tripping system according to claim 2, characterized in that: The middle cover (1) includes a limiting groove (11) extending along the movement trajectory of the eccentric rod (31) and disposed below the adjustment hole (5). The limiting protrusion is slidably accommodated in the limiting groove (11). A limiting stop (12) is provided between the limiting groove (11) and the adjustment hole (5) to prevent the limiting protrusion from falling out of the adjustment hole (5). One end of the limiting groove (11) extends and connects to the inlet (6).

4. The knob mounting structure of the thermomagnetic tripping system according to claim 3, characterized in that: The adjustment hole (5) is arranged in the mounting groove (23) in an arc shape. The eccentric rod (31) moves along the adjustment hole (5) in an arc trajectory under the drive of the knob (3). The diameter of the inlet (6) is larger than the diameter of the adjustment hole (5).

5. The knob mounting structure of the thermomagnetic tripping system according to any one of claims 1-4, characterized in that: The operating lever (33) and the knob disk (32) are coaxially rotatable. The eccentric rod (31) is vertically arranged on the lower side of the knob disk (32) and is not coaxially arranged with the operating lever (33). The operating lever (33) is provided with a drive groove (35) at the top of the upper cover (2).

6. The knob mounting structure of the thermomagnetic tripping system according to claim 5, characterized in that: The anti-reverse rod (7) and the eccentric rod (31) are coaxially arranged on the knob disk (32), and the eccentric rod (31) is integrally formed or fixedly installed on the knob disk (32).

7. The knob mounting structure of the thermomagnetic tripping system according to claim 6, characterized in that: A gear position structure is provided between the knob (3) and the mounting groove (23). The gear position structure includes an elastic lever (34) disposed on the outer periphery of the knob disc (32) and a plurality of gear position slots disposed on the side wall of the mounting groove (23). A buffer groove (37) is provided between the elastic lever (34) and the knob disc (32). During the rotation of the knob (3), the elastic lever (34) is driven to engage with one of the gear position slots.

8. The knob mounting structure of the thermomagnetic tripping system according to claim 7, characterized in that: The multiple gear slots are respectively the initial position slot (90), the first gear slot (91), the second gear slot (92), and the third gear slot (93) set on the side wall of the mounting slot (23). The first gear slot (91), the second gear slot (92), and the third gear slot (93) are arranged at equal intervals. The elastic lever (34) is connected to the initial position slot (90) when the eccentric rod (31) is located at the inlet (6). The line connecting the elastic lever (34) and the anti-reverse rod (7) passes through the axis of the operating rod (33).

9. The knob mounting structure of the thermomagnetic tripping system according to claim 7, characterized in that: An indicator structure for indicating the rotation position of the eccentric rod (31) is provided between the operating lever (33) and the upper cover (2). The indicator structure includes an arrow groove (36) provided at the top of the operating lever (33) and multiple indicator marks provided around the operating lever (33) on the upper cover (2) and corresponding to multiple gear slots. The arrow groove (36) is connected to one end of the drive slot (35), and the anti-reverse rod is located at the end of the arrow groove (36).

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